Call recording and charging system



Aug. '23, '1932.- P. s'roRcH ET AL CALL RECORDING AND CHARGING SYSTEFiled March '11 1951 s sheets-sneet' 1 S S E S IEEFE'HEFE' Paul 5 are :1Russbar'j Hfii.

P. STORCH ET AL CALL RECORDING AND CHARGING SYSTEM Filed March 11. 1931Aug. 23, 1932.

3' Sheets-Sheet a 9N mtm tm m Nmd v h t D .u DE h 5 7 v7. Tm m F P.' STORCH ET AL' CALL RECORDING AN D CHARGING SYSTEM Filed March 11, 1951 .0o M W 3 Q g 2Q Aug. 23, 1932. A

- omen STATES PATENT Patented Aug. 23, 19 32 I OFFICE p P-QULBTOBCH, OFBEBLIN-CHABLOTTENBURG, AND ROSSBERG, OF BERLIN- SIEIIENSSTADT, GERMANY,ASSIGNORS TO SIEMENS & HALSKE AKTIENGESELL- SCHAFT, F WERNERWERKSIEHENSSTADT, NEAR BERLIN, GERMANY CALL RECORDING AN D CHKRGIN G SYSTEM.

Application filed March 11, 1931, Serial No. 521,736, and in GermanyJune7, 1930.

It is desirable in telephone systems as well as in telegraphinstallations with exchanges T to determine not only the number ofconnections set up by subscribers outgoing over the ordinary localexchange, but also the duration of such calls in order to furnish acorrect statement of the charges incurred by the calling subscriber. Fortelephone and telegraph systems with automatic operation it is a knownarrangement to divide the network into zones for the determination ofthe value of-set-up connections, in which case each zone has its owntarifi and when selected a time switch associated therewith influencesthe conversation indicator associated with the calling subscriber givingthe time and distance corresponding to the zone involved. In this mannerthe duration of the call as well'as the zone is determined to a certainextent. v

- In this kind of registration of subscribers connections thedisadvantagehas often been experienced that the total time during whichthe junction line has been busy has-not been indicated but only thecompleted or the cornmenced time sections have been metered. In thefirst place, it is impossible to carry out a supplementary control overthe set-up con nections as neither the zone of the-set-up connectionsnor the duration ofan individual connection can he obtained from thenote made of the conversation indicator, still less then can a specialindication of the direction of an individual connection be obtained.

In order to overcome these difiicult-ies electrically driven recordingdevices are used, according to the invention which automatically, afterthe setting-up of an operative cQn'nection indicate a designation marki. e. the name, place number of the like, allocated to the subscriber,by which a subsequent con-- .The recording dev'ce used for the purposetrol of the sethpgconnections is possible.

of denoting' the i entification marks must,

of course, be allocated either'to the calling .subscriber'as he ischarged with the account for the calls, or it must also indicate anidentification mark for the calling subscriber,

when, for the sake of economy, only a limited numberof such devices areused as recording devices. Ifnot only the set-up connection but also itsduration is to be metered, a time statement in addition to the noting ofthe subscribers identification marks. -must be taken, which, accordingto requirements,- either indicates only the duration of a'connection orelse gives an accurate account of the time, date, etc. i

The record can be taken in any shape or form suitable for the kind oftransmitted subscribers identification marks or for the time statement.In telegraph systems-it is recommended to use a receiving apparatuswhich is suitable in its operation for the telegraph system so that alsothe sender used for the transmission of the subscribers identi-ficationmarks corresponds in its operation to the devices used for the ordinarywork in the system. In this case a particularly advantageous use ofthesubscribers identification marks employed for the registration can becarried out in that the identification mark, allocated to the calledsubscriber, simultaneously with the registration in the exchange is alsotransmitted to the purpose of supervising the set-up connection aswell'as for check back to the calling subscriber. The time statementwhich is taken in order to determine the duration of the connection inthe exchange'can then also be noted and transmitted to the callingsubscriber .with the result that he receives a notification of some sortto the extent of his call.

In addition to the transmission of the identificatlon marks or times tothe calling subscriber, a transmission to the called subscriber cannaturally also be eflected in case he desires full particulars of eachcall in a written statement. 4

Instead of the receiver, fitted to operate in the system, which can bein the form of a recorder'as used in telegraph'systems, op-

erating according to the otf-and-on principle,

plied with a recording device within an exchange as then a simple tapereceiver or'the like can, for example, be used in place of expensiverecorders. In additionito such a mechanical recording as dots or dashesalso other kinds of records can be made. It is possible, for example, toconduct the re-v ceived impulse to an electromagnet which makesimpressions corresponding to the nature of the magnetic influencesreceived.

For the reproduction of impulses recorded in this simple manner, areproducing device can be used which regenerates the recorded impulsesand leads them, for example, to a recording receiver which executes thetransscription of the impulse groups into readable types. Thetranscription can be effected at suitable periods, i. e. at the end ofthe month when the accounts are sent out to the various subscribers.

If an automatic registration of the subscribers identification marks isto be carried out in telephone systems each individual subscriber mustbe supplied with a corresponding device which automatically effects therecording of the identification marks, associated with the subscriber,at the switchingthrough of a connection to a required sub-.

scriber. These sending devices can either be installed at thesubscribers stations or else be connected to the subscribers lines at asuitable position within the exchange. Also in this case it is naturallyof vital importance that the notification takes place over the correctjunction line of the calling subscriber and this can be guaranteedeither by exclusive allocation of the receiving device to the callingsubscriber or by recording also of the identification marks associatedwith the calling subscriber. For a more complete explanation of thefeatures of the invention, embodiments thereof are shown in the drawingswhich, however, do not limit the possibilities of use in any direction.

Fig. 1 shows the known circuit of a subscribers connection, set-up overan automatic exchange. Subscriber T1 who is by way of example, reach therequired subscriber T2 by transmitting corresponding impulses by meansof his dial over preselector VWl, group selector GWl, and the finalselector LWl, with whom he can get into communication on completion ofthe-connection for the purpose of conversation or transmission oftelegrams.

A connection set-up in the reverse direction (2) from subscriber T2 tosubscriber T1 is effected over other switches VW2, GW2, LW2 as suggestedby dotted lines.

An extension of this circuit diagram ac,- cording to the main featuresof the invention is shown schematically in Fig. 2. Each subscriber T1and T2 is now supplied with a sending device on a passing steel wire atoll line subscriber, can

'ceiving device S1 and S2, respectively, as

well as a receiving device El and E2, respectively, for the purpose vofregistering the set-up connection. When, for example, the subscriber T1has reached over switches VVVl, GW1,and LW1 the sending device S2responds at the same time or before the completion of the connection,and now transmits an identification signal allocated to subscriber T2,i. e. his name or number in a suitable form backwards over switches LWl,GWl, and -VW1 to the re ceiving device E1 in which the recording of theidentification signal is effected. At the same time, the identificationsignal can be transmitted in a similar manner tothe calling subscriberT1 also who thereby receives a check on the set-up connection. After theend of the transmission of the identification signals the set-upconnection is prepared for conversation or code signals.

If, in addition to the determining of the subscribers identificationcharacterized a registration of the extent of the call'is to beeffected, a time notification can be transmitted from a time recorded Zto the receivv T ing device E1 consisting by way of example, of theexact time of the beginning and end of the conversation. The timerecorder can be associated with the receiving device E1 in a simple formand operated in such a manner that it is automatically brought intooperation after the complete setting up of a connection or after thetransmission of the identification characterized, but it is recommendedthat a common timing device is used for a plurality of subscribers inthe manner shown.

At the setting up a connection from subscriber T2 to T1, which iscompleted in the direction 2 over switches, VWV2, GW2, and LW2, thesending device S1, associated with the called subscriber T1, is broughtinto operation in a corresponding manner, and trans mits anidentification signal allocated to subscriber T1 to the receiving deviceE2 or simultaneously also to the calling subscriber The connection canbe set-up in any manner over a single exchange or a plurality ofexchanges. g

If a common receiving device for the recording of the subscribersidentification marks is to be used for a plurality of subscribers anarrangement as shown schematically in Fig. 3, by way of example, can beused. When a connection between the subscribers T1 and T2 is set-up thesending device S2 is brought into operation after the completion of theconnection as before, but the recording of-the identificationcharacteristic is not made by a receiving device directly associatedwith subscriber T1, but a rc- E, provided in common for a plurality ofsubscribers, operates and connects itself at the setting upof aconnection the. subscriber T2,

the sending device S2 the sending device S1,-

allocated to the calling subscriber T1, also 5 is brought intooperation, with the result that a determination of the two subscribersidentification signs is effected. The time records, totaling the extentof calls, can also be transmitted in this case by a. commontime recorderZ.

Fig. 4a, in conjunction with Fig. 4b, which should be located below Fig.4a shows-the circuit of a telegraph system inwhich the metering andregistration of connections is effected by a telegraph machine EF, (Fig.4a bottom) which is associated with alar e group of subscribers; itsconnection with t e calling subscribers line is established by a callfinder AS which operates automatically when the subscriber uts throughacall.

In the middle portion of the drawings the two sending devices KS and KSintended for the enquiry of the subscribers identificationcharacteristic are located which are allocated to the subscribers TS andTS, respectively. The impulse combinations which correspond to thesubscribers identification characteristic and which are transmitted overv two of the'contact wipers of the sending devicesKS and KS sendingdevice SS which is shown in the right-hand bottom part of thedrawings(Fig: 4a). The sending device is connected to a time recording mechanismZS (Fig. 4b) which transmits the time.

In the'case of a call from the subscribers station TS (Fig. 4a) whichcan be switched through in the shown or any other known manner, a testrelay T is energized after the hunting of the preselector VW to a freegroup selector GW in known manner. The relay T starts the call. finderAS of a disengaged registering device over its contact t2 1n thecircuiti Earth, t2, asl, DAS, 12, a3, LU battery, earth. The interrupterLU advances the driving magnet DAS step-by-step, upon which the-circuit, after leaving the first contact, no longer extends over contact t2but reaches earth .direct from the contact bank of the rotary wiper asl.

The test wiper cs4, during its hunting to find the contact of thecalling subscriber, finds, a test path closed over contact 251 with theresult that the test relayR of the call finder AS is energ'izedover:earth, battery, t1, resistance W1, as4, R, earth. The test relay Rengages the call finder and thereby the registering device EF by shortcircuiting its high resistance winding I by means of contact r1 is 'setin 'known manner, while at the same time, the Further advancing of thecall finder is prevented by the opening of contact 12. e r N Thereceiving magnet MB of the register- 5 device EFis now connected to theb-lead of the busy junction line,

are generated in a mainover the alternating contact a2 and the rotarywiper as2.

In the meantime the calling subscriber TS, by transmission of selectingimpulses by means of the dial contact as sets up a connection with therequired subscriber TS over the a-lead in known manner, extending over:switches-VW, GW, and LW. Hereby relays P and G are energized at theoperationof the group selector GW to a free final selector LW, thecontacts of which in known-manner influences the circuit not shown) forthe seizure of the switch connecting up of the junction lines,reparation for the release, etc.

On the l iunting of the final selector LW for the line leading totherequired subscriber TS the test relays Q and T are energized if thesubscriber is disengaged. At the'sametime, the relay H (windingDisconnected up over the test lead of the final selector and causes theidentification characteristic mark transmitter KS allocated to therequired subscriber to be operated over: earth, Q, 10, H,

(1) 4101, T, battery, earth.

'The identification transmitter KS operates as soon as contact 72/2 isclosed earth, battery DKS', 7084, 7:2, SK, earth. Contact SK is closedby the cam the'correct time for the connecting up of the N K of the mainsend- Y er SS at regular time intervals in order to fix identificationtransmitter. On the shaft NW of the main sender which carries the .camNK 9. further series of cams NS are fitted which serve to guide theimpulse contacts associated with the letters and numbers for theidentification signs and time record which is achieved by a suitablephase position of the cam NK in relation to the impulse, cam NS in thissimple manner that the'advance of the rotary wipers of theidentification sender,'

transmitting the impulse can only take place in the pauses between theimpulse groups corresponding to the individual roups. The driving magnetDKS of the identification transmitter KS is intermittently energized inthe above-described circuit and thereby advances the rotary wipers KSand KS4 step by-step.

In this manner, while the identification transmitter remains on thesecond contact after the first movement of its rotary magnet 'DKS, animpulse sequence corresponding to the first letter of the identificationsigns of the called subscriber is transmitted over the rotary wiper 7083to the called subscriber TS at the same time to the registering deviceEF.

The generation of the impulse .sequence, corresponding-to this letter i.e. b is efi'ected by contact kb of the-main sender SS which, by the camNS associated therewith, is closed intermittently. according to theimpulse sequence over: earth, battery, resistance W2. lab, a-lead, 1a,b'lead, gb, "bb', wiper of call "findersaa2, 'u 2, MR, earth. Theimpulse sequence is noted by theregistering device EF controlled by theprinting magnet-MR. At the same time a notification takes place at thecalling subscribers station TS by means of a printing'magnet EM of thereceiver in case this is required as a check on the setting up of theconnection. I

After the transmission of the impulse sequence corresponding to thefirst letter of the identification sign (i. e. b) further impulse groupsare transmitted in a corresponding manner by the connection being set upwith corresponding impulse contacts of the main sender by the rotarywiper Ira-'3 of the identification transmitter KS. The further advancetakes place each time in the intervals between the individual impulsegroups at the gging of contact SK by means of the cam In addition tothese impulse groups further impulse groups can be transmitted whicheffect the notification of the exact time or any other time information,and these latter impulse groups can be connected up to the impulsegroups which are so combined that they state the name and place of therequired subscriber in the recorder of the subscriber TS or in theregistering device EF of the exchange. The impulse groups, correspondingto this time statement, are sent out from the time sender ZS (Fig. 4b)the contact wipers SZ, SE, MZ, ME of which complete the connection withthe meter impulse contactslcl, k2, k3, and 704, etc., of the main senderSS, (Fig. 4a). d

The advance of the contact wipers SZ- ME (Fig. 4b) operate the rotarymagnets DSZDME, associated with them, which are operated in the timeperiods corresponding to their tarifi's by contacts ns-mme o a'timeswitch device ZU. The arrangement, by way of example, is so made thatthe contact wiperME is associated with minute periods and is advanced inperiods of one minute for which purpose it is connected in sequence withthe impulse contacts (741,-etc.) of the main sender corresponding todigits 0 to 9. In a similar manner/the advance, of the contact'wipers MZassociated with ten minuteperiods, e. g. every ten minutes, whilethqntact wipers SE and SZ respond to the hour units or ten hour unitsand are advanced accordingly after longer time periods.

By this arrangement it is achieved that, in connection with thetransmission of theidentification characteristic of the calledsubscriber, a transmis ion of impulses is effect.- ed which corresporElsexactly to the correct time. Other infor ative signs, such as stop,common or the like can be transmitted between the records of the timenotification and the notification of the time can also be supplementedby the date.

As soon as the time notification is ended, a special impulse combinationis transmitted over the last but one contact of the identifica- 'tooperateover contact 712 magnet DKS being energized over: earth,

SK, earth. The guidtion sender KS controlling the registering device.This impulse combination which differs from the other signals by itscomposition is generated by a special impulse contact ku of the mainsender and upon its trans- I mission to the receiving magnet MB of theregistering device EF, actuates the closing of a contact UZ which overthe test lead of the call finder connects up relay Uover: earth, UZ, U,as, W1, t1, battery, earth. Relay U remains energized over its owncontact ul, with the result that the contact UZ can return to normal.

At the same time a fresh circuit for the receiving magnet -MR of theregistering device EF is prepared by the changeover contact u2, whichextends over the rotary wiper cs3 of the call finder AS to the rotarywiper 1082 of the identification sender KS allocated to the callingsubscriber. transmitter operates, however, only after the cutting-off ofthe connection in order to transmit simultaneously also the time of thetermination of the conversation.

After the transmission of the change-over signal (we) the. rotary wiperks3 of the identification transmitter/KS allocated to the calledsubscriber is moved to the last contact on which the completion of theconnection of the a-lead to the called subscriber TS is completed.

The junction line between the subscriber TS and TS is now engaged forthe transmission of the telegram in both directions.

During the existing connection the registermechanically Thisidentification ing device and also the identification transmitterallocated to the two subscribers, are

intheir normal positions so that an interf ruption of the transmittedtelegram is prevented. At the same time a listening in to the telegramis also prevented by the registering device EF and by the throwing-overof contact a2, whereby the secrecy regarding the contents of thetelegram is insured.

' After the ending of the telegram transmission the test relay T, at therelease of the connection, is caused to release by the influence ofcontacts known per se, showniorthe sake of greater lucidity. Thereby acircuit for winding II of relay H is closed over contact 253 returningto normal. whereby the idenfication transmitter KS of the callingsubscriber TS is in operation over: earth, battery, H, (II), t3, Iss2,as3, 102, MR, earth. Contact M is closed in order to keep the energizingcircuit for relays R and U closed as an alternative for the now openingcontact t1. The identification transmitter KS starts dueto its rotarybattery DKS, 1084, 71.2,

ing contact SK of the main sender SS again, in the manner alreadydescribed. caus s the advance of the wiper of the identification whichare notsignaltransmitter to be effected in the coran impulse overcontact SK and the rotary wipers of the identification signaltransmitter KS has moved to the next contact the impulse sequences,generated by the cam contacts of the main sender SS. are transmitted tothe receiving magnet MB .of the registering device EF earth, MR, a2,-as3, Iss2,

junction line to-main sender, impulse con- 'is set to normal over earth,asl, DAS, 1'2, a3, LU, battery, earth.

tact (ire. 7m) resistance W2, battery, earth.

When thus the signal has been transmitted to the called subscriber t etransmission of the time notification whici is brought about in. theabove described manner takes place over a second portion of the contactlaminations of the rotary wiper [082.

As soon as this time notification has been recorded by the recordingmachine the identification transmitter KS advances to the last contact.In this position the holding circuit for relay H (winding II) is brokenwhich, before, was closed over the hunting laminatioris of the rotarywiper ksl. The relay H releases slowly and closes thereby the restoringcircuit for the rotary magnets DKS over its contacts 7L2 and 723,respectively, with" the consequence that this sets the switchingmechanism to its original position. Contact k1 breaks the test circuitfor the call finder AS so that relaysR and U are deenergized. A circuitfor the rotary magnet DAS of the call finder AS is then closed by thereturn to normal of contacts 12- and n3, which then In the meantime theidentification transmitter KS of the called subscriber TSl has alsoreached its original position, as at the release of the connection, therelay H1, (winding I) located in the test 'lead of the final selector LWhas released. The rotary magnet DKS now receives the advancing impulsesgenerated by the interrupter RU, over contact h2 or h3,respectively,which bring the rotary wipers to their normal position.

All the switching elements concerned inthe establishment of a connectionare now set back to their original positions and ready for a new call.On the tape of the recording device the statements can be'read' in plainletters which relate to the set-up connection and the duration of itsextension;

v Fig. 5 shows an arrangementin which each subscriber is supplied with"a simple registera ing device which, byway of example, records theimpulses,characteri'zing the set upconnec tion and its-duration onasteel wire drawn in front of a magnet. Impulses stored in this mannercan later be put into clear text by a. recording machine transcribingthe Onthe setti f I relays T, B, P, C, Q, and T are energized am. Inadsigns which form the! basis for the statement of account. a I

1n the drawings the recording device consists of an electromagnet SMwith windings I and II in front of the poles of which a steel wire X ismoved over the drums Y1 and 2. The winding I is influenced at thesettion transmitter allocated to the called subscriber, while winding IIcan be brought into ting-up of a connection by the identificaoperationby a time recorder ZG, shown in the left bottom portion of the drawings,for the purpose of recording the time notifications indicating theduration of the call. A notification of the identification signalallocated to the calling subscriber is not necessary in this case aseach individual record ing device is associated with only one individualsubscriber. In order to make the case clearer only the identificationtransmitter KS, allocated to the'called subscriber TS, is shown in thedrawings, While the one-for the calling subscriber TS has been omitted.

The number of time recorders ZG required in a system can becomparatively small as it is sufficient if, at the establishment andrelease of a connection, a short connecting up of the recording magnetSM to a free time recorder is effected. The selection of a disengagedtime recorder is performed, by way of.

example, by a call finder AS allocated to a group of subscribers.

' When, for example the subscriber TS wishes to transmit a telegram tothe subscriber TS he sets-up the connection selectively by means of hisdial in manner known per se over theswitches VW, GW, and LW.

ng-up of the connection the test DKS over the ca'm contact SK- of themain sender SS, while over the contact wiper 7: '1 the impulse groupstransmitted by the same to the letter contacts ka, kb, kc, etc., of themain sender are meanwhile sent in the a-lead in the sequence whichcorresponds to the identification signals of the subscriber TS.

These impulse groups now reach the winding lof the recording magnet SM'of the registering device over contact wiper 1a of the final selectorLW, the contact wiper gb of the group selector GW andthe wiper ob or thepres'elector VW and further the re .ceivingmagnet SM of the'callingsubscriber TS. The recording magnet SM- thereon rebords the transmittedimpulses of the iden- 'lgo ' clear type,

tification signals on the steel wire X, passing in front of its poles,which in the meantime, has been-set in motion,'while the receivingmagnet EM of the subscriber TS immediately transcribes theidentification signals into so that the calling subscriber receives acheck of the set-up connectien.

Relay U (winding I) which is placed in series with the winding of therecording magnet SM is constructed in such a manner that it is notenergized by the signal impulses. It operates with a slow-actingarmature and the slow action period is so calculated that it cannotrespond to the short signal imulses. Only when the contact wiper ks'l ofthe identification transmitter KS connects battery to the a-lead on oneor a plurality of contacts located in frgnt of the last contact overresistance W4 for a longer period can relay U (winding I) be energized.It then closes a circuit by means of its contact a2 for the holdingwinding II which at the response of the test relay T, has been preparedby the closing of contact t1. The alternating. contact ul disconnectsthe winding 1 of the recording magnet SM and effects, at the same time,the immediate connecting up of the b-lead of the calling subscriber TS.

Instead ofthe slow-acting relay U any other device can be used whichoperates in the same manner over the a-lead or b-lead from theidentification transmitter- KS of the called subscriber. It is possible,for example, to use a polarized relay which remains in one positionduring the transmission of the identification impulses and whichreceives an impulse of opposing current direction at the last but onestep of the contact wiper ks'l which it momentarily guides to anotherposition.

After the connecting up of the b-lead of subscriber TS by thethrowingover' of contact ul the a-lead of the called subscriber TS isalso connected up as the contact wiper'ks'l of the identificationtransmitter KS moves to the last contact. On this contact theidentification transmitter remains until the release of the connectiontakes place.

The connection between the two subscribers is now set-up and thetransmission of the telegram can commence; V

In the vmeantime the call finder AS of the I time recorder ZG has beenstarted over contact a5 and a circuit for the rotary magnet DASotthecall finder has been closed over: earth, b3, M5, (183, DAS, r4, UAS,battery, earth.

The interrupter UAS now advances the switch over the contact bank of therotary wiper as3 until the test wiper asl reaches the contactlaminations of the calling subscriber and the test relay R is energizedvover: earth, battery, 104, H I (II) k2, asl, zgl, R, earth. The testrelay R responds and engages, at the SK of the main sender over thealready closed contact 1 2 is it caused to operate over: earth, battery,a4, H (II) lt2,as1,1-2, SK, earth. It then throws over its contact hi!and remains energized over this in addition to the closed Contact t3 ofthe test relay T.

Simultaneously with the connecting up of relay H the rotary magnet D7 Gof the time recorder ZG isalso energized, with the consequence that thetest relay R remainsenergized over the traversing contact bank of therotary wiper zgll and resistance W1. The rotary magnet DZG is connectedup in the following circuit: earth, battery, DZG, 293, 1'5, SK, earth.Now the time recorder ZG also advances step-by-step according to theoperation of the identification transmitter by the contact SK controlledby the main sender SS, at which the rotary wiper 292 sets-up theconnection with the contact wipers SZ-ME of the time switching device insuccession. The contact wipers SZ-ME are set to the contacts, indicatingthe time in the manner described for Fig. 46, by the rotary magnetsDSZDME, controlled by a time switch ZU. These contacts are connected tothe impulse contacts I01, 702, k3,ietc., of the main sender the contactwiper 292 of the time recorder,

successive impulse groups are transmitted, the combination of whichindicates the time.

When noting down is effected by the recording magnet SM, the winding IIof which is connected to the contact wiper 292 over: a3, M2, and 1'3.

As soon as the time recorder ZG has reached its last contact the rotarymagnet gization of the rotary magnet DZG- over the interrupter UZG. Thetime recorder is thus operated until it ha s reached its originalposition. a

At the release of that test relay R also contact 94 was closed so thatthe call finder AS can also return to normal. A renewed starting of thecall finder cannot now take place as relays H and T remain energized andcontacts t2 and k3 open. The time recorder At the hunting of the wipersSZ-ME by .lease of the connection. A

iii

after efl'ecting the connection between the two subscribers.

A renewed connecting up .of the time re-- corder for the connectionmentioned can only take place when the test relay T, of the callingsubscriber TS is deenergized at the refree time recorder for thenotification of the end of the call is then again started over contactas the rotary magnet DAS of the call finder AS is connected up over"contact wiper as?) in the already described manner. Thetest circuit. forthe call finder is then closed over contact t4 as relay H is energizedand contact k2 thrown over. Thus the contact t3 is opened but the relayH (II) yet remains energized duririg the time notificationyas itreceives theimpulse transmitted by the controlling contact SK over thetest wiper asl. of the call finder and over contact r2 after theresponse of the test relay R. Relay H is constructed in the form of avery sloW-actin relay. Thereby is achieved that relay U II) remainscon.- nected upover contact hl during the time notification.

After the transmission of the impulse groups, correspondingto the'timeof the end of the call, which ise'ifected in the already describedmanner, the test relay R is again deenergized when the, time recorderreaches the last but one contact, with the result that the time recordersition. Hereby relay H also is deenergized with a slow action and causesalso the deenergization of relay U at the opening of contact k1.

Thesystem now is again prepared for further calls as in the meantime theidentification transmitter KS of the called subscriber also has beenbrought toits original position at the release of the connection by therelease of relay H. I

The steel wire X whichis brought torest' after the ending of. each timenotification now carries the transmitted impulses which later can betranscribed into ordinarytype by a special printing machine at acalculation of the charges incurred.

What is claimed is:

1. In a call recording and charging system, calling and calledsubscribers lines,

a means for establishinga'connection between T a calling line and acalled line, means auto- ;matically operative responsive to the'establishment,of said connection'in case the called line is idle fortransmitting back over the established connection an identificationsignal assigned to the called subscribers line, and a recorderassociated with said calling line operated responsive to for recordingsaid called line identification signal.

, 2. In a call recording, and charging system; calling and calledsubscribers lines,

returnsto its starting po said transmission means for establishing aconnection between a calling line and a called line,- meansautomatically operative responsiveto the establishment of saidconnection in case the called line is idle for transmitting back overthe established connection an identification sigrecorder, andmeansresponsive thereto for' operating said recorder to record the callingline identification signal. v

3. In a call recording and charging system, calling and calledsubscribers lines,

means for establishing a connection between a calling line and a calledline, means operative in case the called lineis idle for transmittingback over the established connection an identification signal assignedto the called line and the time of day, a recorder-temporarilyassociated with'the calling line responsive to the establishment of saidconnection and operated responsive to said transmission for recordingsaid called line identification signal and time of day, means forreleasing said connection, and means responsive thereto for transmittingan identification signal assigned to the calling line and the time ofday to said recorder for operating said recorder to record the callingline identification signal and the time of day whereby the lines, arecorder common to said calling lines,

means for establishing a connection between.

a calling line and a called line, means'for associating said commonrecorder with said calling line, means automatically operativeresponsive to the establishmentofsaid connection in case said calledline is idle for transmitting back over said established connection canidentification qsignal'assigned to the called subscribers' line, andmeans responsive tosaid transmission for operating.

both the individual and the common record ers to :record the called'line identification signal.

5. In a call recording andcharging system, calling and calledsubscribers"lines, a recorder individual to each of'said calling lines,a recorder common-tosaid calling lines, means'for' establishing aconnection between a calling line and al'called -line, means for.

associating said common recorder'with said calling line, meansautomatically operative responsive to the establishment ofsaid'connection in case said called line is idle) for transmitting backover said established connection an identification signal assigned tothe called subscribers line, and time signals,

and means responsive to said transmission for operating both theindividual and the common recorders to record the called lineidentification signal and said tnnc signals.

6. In a call recording and charging system,

calllng and called subscribers lines, an 1111- pulse sender common tosald lines, a switch individual to each line having their bank contactswire'dto said impulse sender in accordance with their assigned numbers,a recorder, means for establishing a connection between a calling lineand a called line, means responsive to the establishment of saidconnection for connecting the switch individual to the called linetosaid sender, means controlled by said sender for operating saidindividual switch and for transmitting a signal indicative of the calledline over the contacts connection between a calling and a called line,means controlled by said sender responsive to the establishment of saidconnection for operating the switch individual to the called line andfor transmitting a signal indicative of the called line andthe time ofday over the contacts and said connection, and means responsive to saidtransmission for operating said recorder. to record the calledsubscribers signal and the time of day.

8. In'a call recording and charging system, calling and'calledsubscribers lines, an impulse sender common to said lines, a switchindividual to each of said lines having their bank contacts wired tosaid sender in accordance with their assigned numbers, a recorder,

means for establishing a connection between i a calling and a calledline, means controlled by said sender responsive to the establishment ofsaid connection for operating the switch individual to the called lineand for transmitting a signal indicative of the called line; over thecontacts of said individual switch and said connection, means forreleasing saidconnection, means controlled by said sender responsive tosaid disconnection for operating. the switch individual to the callingline and for transmitting a signal indicative of the calling line overthe contacts of the switch individual to the calling line, and meansresponsive to both transmissions for operatingsaid recorder to recordthe called and calling subscribers signals."

9. In a call recording'and charging system, calling and calledsubscribers lines, an

means responsive to lines, an imimpulse sender common to said lines, atime switch common to said lines, a switch individual to each of saidlines connected to said sender and time switch, a recorder, means forestablishing a connection between a calling vand a called line, meanscontrolled by said sender and time switch responsive to theestablishment of said connection for operating the switch individual. tothe called line and for transmitting a signal indicative of said calledline and the time of day over said connection, means for releasing saidconnection, means controlled by said sender and time switch responsiveto said disconnection for operating the switch individual to the callingline and for transmitting a signal indicative of said calling line andthe time of day, and both transmissions for operating said recorder torecord the called and calling subscribers identification signals and thetime of day the connection was established and released. 7

10. In a call recording and charging system, calling and called.subscribers lines, means for establishing a connection between a callingline and a called line, means responsive to the establishment of saidconnection for transmitting an identification signal assigned to thecalled subscribers line, and a recorder associated with said callingline operated responsive to said transmission for retiording said calledline identification signa "11. In acall recording and charging system,calling and called subscribers lines, means for establishing aconnection between a -calling line and a called line, means responsiveto the establishment'of said connection for transmitting anidentification signal assigned to the called subscribers line, arecorder operated responsive to said transmission for recording saidcalled line identification signal, means for transmitting anidentification signal assigned to the calling line to said recorder, andmeans responsive thereto for operating said recorder to record thecalling line identificationisi'gnal.

12. In a call recording and-charging sysoperated responsive to saidtransmission for recording said calling line identification signal andtime of day, means for releasing said connection, and means responsivethereto for. transmitting an identification signal assigned to thecalling line' and the time of day to said recorder for operating saidrecorder to recordthe calling line identification signal-and the time ofday whereby the duration of the i call is likewise recorded. v a 13. Ina call recording and char 'ng system, calling and called subscriberslines, a

recorder individual to each of said lines, a recorder common to saidcalling hnes, means for establishing a connection between a calling lineand a called line, means for 5 associating said common recorder withsaid calling line, means automatically operative responsive to theestablishment of said connection for transmittin an identificationsignal assigned to the called subscribers line, and

' 10 means responsive to said transmission for operating both theindividual andthe common recorders to record the called lineidentification signal.

In witness whereof, I hereunto subscribe 15 my name this 27 th day ofJanuary, A. D. 1931.

PAUL STORGH. In witness whereof, I hereunto subscribe my name this 27thda of January A.D. 1931.

, EHR ROSBERG.

